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CLSPWM

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
1210 AM EDT SUN SEP 05 2021

...................................

...THE PORTLAND ME CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM
6/1/2021 TO 8/31/2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1941 TO 2021 (FOR TEMPERATURES)
CLIMATE RECORD PERIOD: 1871 TO 2021 (FOR PRECIPITATION)
CLIMATE RECORD PERIOD: 1882 TO 2021 (FOR SNOWFALL)

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            103   08/02/1975
 LOW              33   08/31/1965
                       06/04/1944
HIGHEST           97   06/28         93       4       94  07/20
LOWEST            46   06/01         42       4       37  06/01
AVG. MAXIMUM    78.1               77.3     0.8     79.9
AVG. MINIMUM    59.9               58.6     1.3     61.1
MEAN            69.0               68.0     1.0     70.5
DAYS MAX >= 90     7                4.2     2.8       13
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       22.31   2009
 MINIMUM        4.10   1999
TOTALS         12.58              11.15    1.43     7.96
DAILY AVG.      0.13               0.12    0.01     0.09
DAYS >= .01       33               31.9     1.1       27
DAYS >= .10       22               18.8     3.2       15
DAYS >= .50       10                6.7     3.3        4
DAYS >= 1.00       3                2.6     0.4        2
GREATEST
 24 HR. TOTAL   2.34   07/08 TO 07/09

SNOWFALL (INCHES)
RECORDS
 TOTAL           0.0
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.0                0.0     0.0
SNOWDEPTH AVG.     0
DAYS >= TRACE      0                0.0     0.0        0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0
 24 HR TOTAL     0.0

DEGREE DAYS
HEATING TOTAL     75                115     -40       73
 SINCE 7/1        31                 21      10       15
COOLING TOTAL    474                390      84      605
 SINCE 1/1       490                401      89      623
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.2
HIGHEST WIND SPEED/DIRECTION    25/140    DATE  06/30
HIGHEST GUST SPEED/DIRECTION    34/010    DATE  06/30

SKY COVER
AVERAGE SKY COVER           0.57

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              9     HEAVY RAIN                10
RAIN                     12     LIGHT RAIN                42
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       47
FOG W/VIS <= 1/4 MILE     9     HAZE                       7

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

AFTER A COLD AND WET MEMORIAL DAY WEEKEND, A WARMING TREND BEGAN.
ONLY A WEEK INTO JUNE AND THE FIRST HEAT WAVE OF SUMMER HAD ARRIVED.
THE HOTTEST TEMPERATURE REACHED 94 ON JUNE 7. ALTHOUGH A FEW COLD
FRONTS BROUGHT SOME RELIEF FROM THE HEAT, THE WARM AND HUMID AIR
KEPT RETURNING. ANOTHER HEAT WAVE ARRIVED FOR THE END OF JUNE WITH
THE TEMPERATURE TOPPING 95 DEGREES FOR 3 STRAIGHT DAYS. THE HOTTEST
WAS 97 ON JUNE 28. THE LOW OF 75 ON JUNE 29 WAS THE WARMEST LOW
TEMPERATURE ON RECORD FOR THE MONTH OF JUNE. THE MULTIPLE BOUTS OF
SUMMER HEAT SECURED JUNE 2021 AS THE HOTTEST ON RECORD AT PORTLAND,
AND IT WAS ONE OF THE DRIEST AS WELL. BUT JUST AS THE SUMMER`S NEXT
HOLIDAY WEEKEND ARRIVED, THE WEATHER TURNED COLD AND RAINY AGAIN.
NEARLY 2 INCHES OF RAIN FELL OVER THE INDEPENDENCE DAY WEEKEND WITH
THE TEMPERATURE BARELY RISING INTO THE 60S. AFTER A BRIEF WARM UP,
THE REMNANTS OF TROPICAL STORM ELSA TRACKED NEAR THE AREA, DROPPING
MORE THAN 2 INCHES OF RAIN ON JULY 9. A SERIES OF COLD FRONTS
BROUGHT COOL CANADIAN AIR MASSES INTO THE REGION FOR MOST OF THE
MONTH. FREQUENT ROUNDS OF SHOWERS AND THUNDERSTORMS ACCOMPANIED THE
FRONTAL PASSAGES AS WELL. THE UNUSUALLY COOL AND WET MIDSUMMER
CONDITIONS BROUGHT THE 2ND WETTEST JULY ON RECORD AND THE COOLEST IN
MORE THAN A DECADE. THIS PATTERN BEGAN TO CHANGE IN AUGUST WITH WARM
AND HUMID CONDITIONS RETURNING. THE FIRST HOT STRETCH PEAKED AT 90
ON AUGUST 14. THE REMNANTS OF TROPICAL STORM FRED BROUGHT NEARLY AN
INCH OF RAIN ON AUGUST 19, WITH TROPICAL STORM HENRI MAKING LANDFALL
IN SOUTHERN NEW ENGLAND JUST A FEW DAYS LATER ON AUGUST 22. ASIDE
FROM THESE TWO SYSTEMS, VERY LITTLE RAIN FELL WITH HOT AND HUMID
CONDITIONS RETURNING AGAIN FOR THE END OF AUGUST.

THE AVERAGE TEMPERATURE WAS 69.0 DEGREES WHICH WAS 1.0 DEGREES ABOVE
NORMAL. ALTHOUGH A FULL 1.5 DEGREES COOLER THAN LAST SUMMER, IT WAS
STILL THE SECOND WARMEST SUMMER ON RECORD. THE SUMMER HAD TWO MONTHS
OF HOT AND HUMID WEATHER WITH THE COOL JULY SANDWICHED IN BETWEEN.
THE HOTTEST SUMMER WAS IN 2020 WHEN THE AVERAGE TEMPERATURE WAS 70.5
DEGREES. THE COOLEST WAS 63.7 DEGREES IN 1964. THE FOLLOWING TABLE
LISTS THE WARMEST SUMMERS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE IN SUMMER (SINCE 1940)...
RANK  AVE  YEAR
1    70.5  2020
2    69.0  2021  <===
3    68.9  2018
     68.9  2016
5    68.7  2010
     68.7  1988
7    68.6  1999
8    68.5  2012
     68.5  1991
     68.5  1973

A TOTAL OF 12.58 INCHES OF PRECIPITATION FELL WHICH WAS 1.43 INCHES
ABOVE NORMAL. THREE QUARTERS OF THIS RAIN FELL IN THE MONTH OF JULY
AS APART FROM THIS VERY RAINY MONTH, THE REST OF THE SUMMER WAS
QUITE DRY. THE HEAVIEST RAIN WAS ON JULY 8 AND 9 WHEN 2.60 INCHES OF
RAIN FELL. THE WETTEST SUMMER WAS IN 2009 WHEN 22.31 INCHES FELL.
THE DRIEST WAS IN 1999 WITH ONLY 4.10 INCHES.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SUMMER 2021...
DATE    RECORD                               PREVIOUS
JUN 6   68   - WARMEST LOW TEMPERATURE       63 IN 2020
JUN 6   78   - WARMEST AVERAGE TEMPERATURE   73 IN 1963
JUN 7   64   - WARMEST LOW TEMPERATURE       63 IN 1999
JUN 7   79   - WARMEST AVERAGE TEMPERATURE   79 IN 1999 (TIED)
JUN 8   92   - WARMEST HIGH TEMPERATURE      90 IN 1999 AND OTHERS
JUN 8   72   - WARMEST LOW TEMPERATURE       60 IN 2014 AND OTHERS
JUN 8   82   - WARMEST AVERAGE TEMPERATURE   75 IN 1941
JUN 29  96   - WARMEST HIGH TEMPERATURE      96 IN 1944 (TIED)
JUN 29  75   - WARMEST LOW TEMPERATURE       68 IN 1999 AND OTHERS
JUN 29  86   - WARMEST AVERAGE TEMPERATURE   82 IN 1944
JUN 30  71   - WARMEST LOW TEMPERATURE       65 IN 2018 AND OTHERS
JUN 30  83   - WARMEST AVERAGE TEMPERATURE   79 IN 1971
JUL 18  1.17 - GREATEST PRECIPITATION        1.12 IN 2008
AUG 9   4    - SMALLEST TEMPERATURE RANGE    5 IN 2013 AND OTHERS
AUG 13  72   - WARMEST LOW TEMPERATURE       72 IN 1944 (TIED)
AUG 20  68   - WARMEST LOW TEMPERATURE       67 IN 2015
AUG 22  5    - SMALLEST TEMPERATURE RANGE    5 IN 1966 (TIED)
AUG 23  3    - SMALLEST TEMPERATURE RANGE    5 IN 2015
AUG 28  9    - SMALLEST TEMPERATURE RANGE    9 IN 2011 AND OTHERS (TIED)

$$

KIMBLE